This paper deals with the relationship between grain yield and grain losses during harvest. Measurements were carried out on a combine harvester with axial harvesting device allowing various adjustments to combine harvester parameter settings, such as rotor speed, gap between separator and rotor, fan speed, holes of the upper and lower sieves. Values of harvest losses in combine harvester with custom settings for the given crops were compared with values of losses obtained by a harvester with manufacturer's recommended settings. This paper observes the losses in grains of spring barley and winter wheat crops. All the measurements made showed lower grain losses when the combine harvester settings were customized. In general, custom settings provided quantitative losses lower by 0.198% than settings recommended by manufacturer.

This paper shows the usage of the Maplesoft 13 program to study the lateral stability of the tractor mulcher mounted on a hydraulic arm connected to the tractor using a 3 point hitch. The results of the tractor stability analysis are in a graphical form with respect to the torque forces caused by the mulcher support arms weight and other present forces during its work operation.

This paper concerns the results of changes in soil compaction after the passages of combine harvester. The research was done on the maize-stubble; the soil was the mold formed in the sand. The measured parameter was a penetration of resistance in range of depth 0–60 cm. The measurements were done in the ruts after the passages the front and rear wheel of combine harvester. During the experiment two levels of vertical load of wheels were applied – these levels were dependent on filling of grain tank of harvester. Moreover, the influence of the lateral tilt of harvester on the soil compaction was analyzed (the harvester was equipped with the leveling system which allowed to obtain the tilt). The obtained results shows that the increase in vertical load caused greater compaction in ruts. Furthermore, it was found that the passage of tilted harvester caused lower compaction than the harvester without tilt.

JÁNSKÝ, J., POSPÍŠIL, J.: Economic effi ciency of legume-cereal intercrops in conditions of organic farming. Acta univ. agric. et silvic. Mendel. Brun., 2010, LVIII, No. 6, pp. 189-198 The paper presents economic analysis of growing of legume-cereal intercropping in conditions of organic farming. Results of the analysis are based on data monitoring in chosen organic farms that grow LCI. In the paper there is also compared economic effi ciency of LCI grown in organic and conventional farming system. Methodological solution results from costingness and earnings monitoring of LCI production in fi ve chosen organic farms in the period [2007][2008]. When evaluating costs existing in individual variants of LCI growing it is necessary to say that the selection of individual machines and machine aggregations represents the most important factor of infl uencing direct costs, namely with regard to the size of organic farms and to the area of individual fi eld blocks. Under conditions of organic farms, the LCI production is also signifi cantly infl uenced also by agrotechnical (tillage) operations. As compared with conventional farms, the fi nal yield of both green fodder and grain is lower by 14-38%. Total direct costs per hectare of harvested LCI acreage ranged in case of fodder production from 9.249 CZK to 11.620 CZK per hectare. In case of grain production, the corresponding costs ranged from 8.848 to 9.970 CZK per hectare. In case of LCI, the direct costs of organic farms per unit of production of both fodder and grain consist mainly of material costs, which represent 63-76% and 61-68% of total expenses associated with production of fodder and grain, respectively. These direct costs are infl uenced also by higher prices of inputs. economic effi ciency of LCI-growing, LCI costs, LCI revenuesThe system of organic agriculture, in proportional scope and in chosen conditions, with keeping the principles of environment undamaging and the equilibrium state in organic agricultural systems, it is one of the ways that could play important part for permanent defensibility of agriculture, but with lower revenues. From the defi nition of the organic farming there especially follows that organic farming is not only simple conventional agriculture where we stop to use synthetic fertilizers and pesticides. It is concerned using of the whole system of measures, such as reduction of period, when land is not covered by vegetation, by using of intercrops, by structure of crops with choice of suitable variety and their right turning in the rotation of crops; suffi cient organic fertilizers; prevention in protection against injurious agents and other grower and breeder processes, but especially responsibility of farmer and keeping of directives that organic farming abide by. It explains favourable impacts of this way of farming upon environment.Growing of legume-cereal intercropping (LCI) in organic farming represents solution of current problems in legume growing in this system of farming (Houba, 2009). It represents production...

The paper analyses the machinery costs associated with the performance of the individual operations when growing and harvesting the legume-cereal intercrops (LCI). For this purpose, a database of costs associated with the individual operations concerning the LCI growing has been created. This database is continuously updated in such a way that it enables to estimate variable costs associated with the individual LCI growing and harvesting operations. The authors followed up and analysed the process of growing and harvesting the LCI as a fodder crop and preserving the harvested material in the form of haylage and silage or for grain (both wet and dry). The analysed data were obtained in the course of the individual operations of machinery used in the individual technologies of establishing and growing of the LCI under the conditions of organic farming.